JPH0924729A - Vent duct - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the pressure loss at a blow-out hole, and to prevent the invasion of the water such as a can washing water. SOLUTION: Butterfly valves 18 surface-contacting to the outer end faces of an upper partition piece, a lower partition piece, a left partition piece, and a right partition piece, have the ends of the inclination α shown in a dashed line Z, in order to maintain the blocking condition of the air holes 30 by their self-weight, and as a result, the inner surfaces of the butterfly valves 18 are surface-contacted by the weights (vector components) of the butterfly valves 18. Since the blocking condition is maintained by only the self-weight of the butterfly valves 18, the blocking condition can be released easily by the air pressure difference more than the self-weight. Even though the water pressure is applied from the outer side of the car room in the car washing condition, the blocking condition is maintained, and since the water adhered to the outer surfaces of the butterfly valves 18 can flow to the lower direction, the water in the car washing condition never flows into the car room.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vent duct in which a plate-shaped butterfly valve is attached to a frame body having a ventilation window, and in particular, indoor air disposed in a vehicle can be discharged to the outside of the vehicle. The present invention relates to a vent duct having an improved opening structure.

[0002]

2. Description of the Related Art As a conventional vent duct of this type, there is a quarter vent duct provided on the rear side of a rear bumper of an automobile. This quarter vent duct is one in which a plate-shaped butterfly valve is attached to a frame body with a ventilation window, and this quarter vent duct introduces outside air into the passenger compartment from the outlet of the instrument panel and introduces it. The discharged outside air is discharged through the vehicle interior.

FIG. 6 is a perspective view of a passenger car having a conventional vent duct.

In order to make the passenger car 1 room more comfortable, air is introduced into the room from the outside through an instrument panel (not shown), and by increasing the pressure of the room air, a body near the side of the bumper 2 is introduced. The interior of the vehicle is ventilated by exhausting air through the vent duct 3 installed in the vehicle.

[0005]

This vent duct is
Whether the state in which the outside air is introduced into the vehicle compartment from the outlet of the instrument panel is "strongest" or "weak", it is necessary to respond to the introduction of the outside air. Therefore,
Usually, the elastic force of a plate-shaped butterfly valve maintains the closed state of the ventilation window, or a magnetic material is used for the butterfly valve and the frame body, and the closed state is maintained by the attraction force of both.

[0006] However, the demand for the vent duct is that the butterfly valve does not easily open even if the washing water is bathed when washing the vehicle with high-pressure washing water, or the outside air from the blowout port of the instrument panel is "weak". In order to easily open the butterfly valve even when it is introduced in the above condition, there is a demand for a structure that satisfies both of them at the same time. Therefore, normally, it is necessary that the plate-shaped butterfly valve be easily opened even when the air is blown "weakly" from the air outlet of the instrument panel into the passenger compartment. This will be described with reference to FIG.

FIG. 7 is an explanatory view of a cross section of a conventional vent duct mounted on a passenger car.

The opening of the vent duct is composed of a frame 5 attached to the body 4, an opening 6 existing inside the frame 5 and a butterfly valve 7 capable of closing the opening 6. Therefore, when indoor ventilation is required, it is necessary to reduce the pressure loss of the air flow exhausted from the room under a slight pressure to surely open the butterfly valve 7 and also to prevent rainwater from entering. is there. On the contrary, when ventilation is unnecessary, it is necessary to gently block the opening 6 with the butterfly valve 7 to prevent water from entering during car washing.

Therefore, an object of the present invention is to provide a vent duct capable of reducing the pressure loss at the air outlet and preventing the intrusion of water such as car washing.

[0010]

According to a first aspect of the present invention, there is provided a vent duct, wherein a frame body having an opening for ventilating air in a vehicle compartment of an automobile, and an opening of the frame body are divided into a plurality of compartments to separate the air in the vehicle compartment. In a vent duct comprising a partition that divides the flow, and a plate-shaped butterfly valve whose upper end is fixed to the partition and whose lower end is arranged to be openable and closable,
A lower position extends more outward than an upper position, and the butterfly valve is arranged at substantially the same angle on the outer end surface of the partition piece in a non-ventilated state of the indoor air to be in a sealed state. Is.

In the vent duct according to the second aspect, the outer end surfaces of the plurality of flow dividing means are in the range of 50 to 70 degrees with respect to the horizontal direction.

[0012]

According to the first aspect of the present invention, the opening of the frame body having the opening for exhausting the indoor air of the vehicle is divided into a plurality of upper and lower parts, and the upper end is fixed to the partition for dividing the exhaust flow, and the lower end. The plate-shaped butterfly valve, which is openable and closable, has a lower position that extends more in the outdoor direction than in the upper position when the indoor air is not ventilated, and is placed at approximately the same angle on the outer end face and sealed. It is in a state, and it blocks the opening of the vent duct.
Under ventilation, the butterfly valve receives the pressure in the room and its free lower end moves outward to form a gap between the partition and the butterfly valve, and the air in the room blows out from the gap. To be done. Since the outer end surfaces of the partition pieces extend outwardly as they go downward, the airflows ejected from the gaps are in substantially the same direction.

According to the second aspect of the present invention, the plate-shaped butterfly valve can be easily opened and closed, corresponding to the normal air flow in the vehicle compartment.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a vent duct embodying the present invention in a ventilation system for passenger compartments of passenger cars will be described below in detail with reference to the drawings.

Regarding the structure of the ventilation system in which the vent duct of this embodiment is arranged in the rear part of the passenger car and the air in the room is exhausted to the outside through the opening, the structure of this embodiment is the same as the prior art. Is.

FIG. 1 is a perspective view showing an essential part of a vent duct according to an embodiment of the present invention partially broken away, and FIG. 2 is a sectional view showing an essential part of a vent duct according to an embodiment of the present invention. is there. FIG. 3 is a cross-sectional view of essential parts of the vent duct according to the embodiment of the present invention under a ventilated state.

As shown in the drawings, in the present embodiment, the rear side body 1 on the side (or rear surface) of the passenger car is shown.
1 has an opening 12 formed therein. When implementing the present invention, the opening 12 may be formed in the rear portion of the passenger car.

The short-angle tubular frame body 13 forms the entire outer shape, and the outer end of the frame body 13 is
A square-shaped flange portion 14 extending outward is formed, and a screw hole is formed in the flange portion 14 so as to be fixed to the rear side body 11 by a screw 15. There is.

In the present embodiment, the upper surface 13a and the lower surface 13b among the upper surface 13a, the lower surface 13b, the left side surface 13c (not shown) and the right side surface 13d constituting the frame body 13 are provided between the upper surface 13a and the lower surface 13b. Upper surface 13a and lower surface 1 which are uniformly divided
Upper partition 16a and lower partition 16b parallel to 3b
Are formed. In addition, the left side surface 13c (not shown) and the right side surface 13d are uniformly divided, and the left side surface 13c (not shown) and the left side partitioning piece 16c (not shown) and the right side partitioning piece parallel to the right side surface 13d. 16d is formed. The upper partition 16a, the lower partition 16b, the left partition 16c (not shown), and the right partition 16d intersect each other to form nine vent holes 30 having a uniform opening area. Here, the opening area of the vent hole 30 is represented by a vertical cut surface with respect to the upper surface 13a and the lower surface 13b.
It is also a vertical cutting plane with respect to c (not shown) and the right side surface 13d.

Here, the vertical interval Y is defined by the upper partition 16a.
And the position of the lower partition 16b, the left and right spacing X
Is determined by the positions of the left side surface 13c (not shown) and the right side surface 13d. In the present embodiment, the aspect ratio, which is the ratio (Y / X) of the latter to the former, is set within the range of 1 to 1 ± 0.5 in order to reduce the pressure loss of the air passing through the ventilation holes 30. ing. The opening area of the vent hole 30 is usually set in the range of 10 to 30 cm ² , but according to the experiments of the inventors, the range of 15 to 20 cm ² is suitable because the pressure loss is low. In the present embodiment, it is divided into three parts in the vertical direction and three parts in the horizontal direction, but in the case of implementing the present invention, it may be divided into a plurality of parts. It does not specify the number of divisions in the direction.

Further, the outer end positions of the plurality of upper partition pieces 16a, lower partition pieces 16b, left partition pieces 16c (not shown) and right partition pieces 16d are changed from the upper position to the lower position, Many of these outer end surfaces 16A extend outward, and the inclination angle α indicated by the one-dot chain line Z, that is, the lower surface 1
It is set to approximately 60 degrees with respect to the horizontal plane of 3b. According to experiments by the inventors, when the present invention is carried out, the pressure loss is small and practical in the range of 50 to 70 degrees with respect to the horizontal plane of the lower surface 13b. confirmed. That is, the positions of the outer end surfaces 16A of the plurality of upper partition pieces 16a and lower partition pieces 16b, the left partition piece 16c (not shown), and the right partition piece 16d are the inclination angle α = 60 degrees indicated by the one-dot chain line Z. Is on the line.

The upper end portion of each butterfly valve 18 is fixed to the step portion inside the upper surface 13a constituting the frame body 13 by a screw 20 via a pressing member 19 so as to close the vent hole 30. Similarly, on the lower surface side of each of the upper partition 16a and the lower partition 16b, the ventilation port 3 at the bottom thereof is provided.
The upper end of each butterfly valve 18 is fixed by a screw 20 via a pressing member 19 so as to close 0. The lower end of each butterfly valve 18 is swingable. The pressing member 19 has rigidity to uniformly transmit the pressing force of the screw 20 to each butterfly valve 18, and the surface pressure of the screw 20 against the upper plane of the pressing member 19 parallel to the inclined surface. To be uniform. The butterfly valve 18 is made of a flexible material such as synthetic rubber or synthetic resin having a predetermined mass.

Each butterfly valve 18 disposed in each ventilation hole 30 is attached to the upper partition 16a and the lower partition 16b. The outer end surfaces 16A of the left partition 16c (not shown) and the right partition 16d, the left side surface 13c (not shown) and the right side surface 13d of the frame body 13 are also one-dot chain lines. There is a step with an inclination angle α indicated by Z, and the inner surfaces of the butterfly valves 18 are in surface contact with each other in a non-ventilated state in the room. Then, the upper surface 13a forming the frame body 13
A step is also formed inside the step, and the step is the one-dot chain line Z
The inclination angle is α. Furthermore, the frame body 13
16A of the entire outer side surface of the lower surface 13b forming the
The inclination angle is α. Each butterfly valve 18
In the non-ventilated state of the room, the outer end surface 16A and the inner surface of each butterfly valve 18 are in surface contact with each other. Further, in the ventilated state, room air flows out through a gap formed between the two.

The vent duct of this embodiment having the above-described structure operates as follows.

When it becomes necessary to ventilate the interior of a passenger car, air is taken in from the outside of the vehicle as in the conventional case, and, for example, outside air is introduced into the room from an instrument panel. Then, the air pressure in the room rises, and accordingly, the lower ends of the respective butterfly valves 18 arranged in the respective ventilation holes 30 move outward to form a predetermined gap. Then, the air in the room is exhausted to the outside from between the inner surface of the butterfly valve 18 and the upper partition 16a, the lower partition 16b, and the lower surface 13b forming the frame body 13, and the indoor air pressure of the butterfly valve 18 and the butterfly. The opening area of the valve 18 is in equilibrium. When the indoor air is not ventilated, the butterfly valve 18 closes the vent holes 30 by its own weight.

As described above, the butterfly valve 18 according to the present embodiment has a step portion inside the upper surface 13a constituting the frame body 13, the upper partition 16a and the lower partition 16b.
Is attached to the lower surface side of each of the above, and the upper end portion of each butterfly valve 18 is fixed by a screw 20 via a pressing member 19 so that each ventilation port 30 is closed or a predetermined opening degree is achieved by the room pressure. Between the piece 16a, the lower partition piece 16b, and the lower surface 13b forming the frame body 13, further, the outer end surface 1 of the left partition piece 16c (not shown) and the right partition piece 16d.
6A, and the outer end surface 16 of the step formed on the left side surface 13c (not shown) and the right side surface 13d forming the frame body 13
A gap is formed in A.

At this time, between the upper partition 16a, the lower partition 16b, and the lower surface 13b constituting the frame body 13, the left partition 16c (not shown) and the right partition 16d.
The butterfly valve 18 that comes into surface contact with the outer end surface 16A of the frame body 13 and the outer end surface 16A of the step formed on the left side surface 13c (not shown) and the right side surface 13d of the frame body 13 are The closed state of the vent 30 is maintained. In particular, the upper partition 16a and the lower partition 16b
Mounted on The outer end surfaces 16A of the left partition 16c (not shown) and the right partition 16d, the left side surface 13c (not shown) and the right side surface 13d of the frame body 13
Since the inside of the surface has a step with an inclination angle α indicated by the one-dot chain line Z, when the butterfly valve 18 is bent by the weight and air flow, the elasticity of the butterfly valve 18 causes the butterfly valve 18 to bend.
The inner surface of the is in surface contact. Therefore, each butterfly valve 18 will not open even if the pressure on the outside of the vehicle becomes high. Further, even if water pressure is applied from the outside of the vehicle compartment at the time of car washing, the water which is attached to the outer surface of each butterfly valve 18 can be maintained in the closed state and flow downward. Does not flow into the passenger compartment.

On the contrary, when the butterfly valve 18 is in the closed state, it is maintained only by its own weight, and the elastic force of the butterfly valve 18 does not strongly maintain the closed state. There is no change in the rate and stable operation is possible. As a result, the pressure loss due to the butterfly valve 18 in each vent hole 30 becomes small, and it becomes possible to ventilate the room with a pressure difference smaller than that in the conventional technique.

Further, in this embodiment, the upper surface 13a, the lower surface 13b and the left side surface 13 constituting the frame body 13 are formed.
An upper partition 16a and a lower partition 16b are provided between the four surfaces c (not shown) and the right side surface 13d, and the left partition 1
6c (not shown) and the right partition 16d are formed, thereby forming a plurality of vent holes 30.
When the air flows out of the plurality of ventilation holes 30 to the outside of the room, as shown in FIG. 3, the air flows are in substantially the same direction, and interfere with the air flows flowing out of the respective ventilation holes 30, and Vortices are unlikely to be generated in the airflows flowing from the respective ventilation holes 30, so that they merge together. As a result, the air flow flowing from each vent hole 30 can be divided almost uniformly.

In order to confirm the effect of this embodiment, the present inventors conducted an experiment on the vent duct structure conceptually shown in FIGS. 4 and 7.

FIG. 4 is a sectional view of a main part showing the structure of a vent duct as a comparative example corresponding to FIG. 2, and FIG. 5 is a measurement of pressure loss shown in the embodiment of the present invention and Comparative Examples 1 and 2. It is a characteristic view which shows a result.

That is, a ventilation experiment was conducted under the same conditions for another comparative example having the same basic structure as that of this embodiment as shown in FIGS. 4 and 7, and the embodiment shown in FIG. And the measurement results of the pressure loss shown in Comparative Example 1 and Comparative Example 2.

Here, Comparative Example 1 is the conventional example shown in FIG. 7, and Comparative Example 2 is the conventional example shown in FIG. It can be seen that the embodiment of the present invention has a smaller pressure loss than Comparative Examples 1 and 2.

As described above, the vent duct according to the present embodiment has the frame body 1 having the opening for exhausting the indoor air of the vehicle.
3 and the flange portion 14, and an upper partition 16a, a lower partition 16b, and a left partition 16 which divide the opening of the frame into a plurality of upper and lower parts to divide the flow of the exhaust gas.
In a vent duct comprising a partition piece composed of c (not shown) and a right partition piece 16d, and a plate-shaped butterfly valve 18 having an upper end fixed to the partition piece and a lower end openably and closably arranged, As shown by the one-dot chain line Z in FIG. 2, the partition piece extends outward more in the lower position than in the upper position, and the butterfly valve 18 is provided on the outer end surface of the partition piece under the non-ventilated state of the indoor air. 16A arranged in a straight line,
This is a sealed state, and this can be an embodiment corresponding to claim 1.

Therefore, the butterfly valve 18 is in surface contact with the outer end surface 16A of the upper partition 16a, the lower partition 16b, the left partition 16c (not shown), and the right partition 16d.
Has an end portion with an inclination angle α indicated by the one-dot chain line Z so as to maintain the closed state of each vent hole 30 by the weight of the butterfly valve 18, and therefore is bent by the weight and air flow of each butterfly valve 18. In that case, the inner surface of each butterfly valve 18 comes into surface contact due to elasticity. And the butterfly valve 18
Since the closed state is maintained only by its own weight (correctly, the vector component determined by the tilt angle α indicated by the one-dot chain line Z), the closed state can be easily released by the air pressure difference larger than that. Therefore, each butterfly valve 18 will not open even if the pressure on the outdoor side of the vehicle becomes high. Further, even if water pressure is applied from the outside of the vehicle compartment at the time of car washing, the water which is attached to the outer surface of each butterfly valve 18 can be maintained in the closed state and flow downward. Does not flow into the passenger compartment.

Further, when the butterfly valve 18 is in the closed state, it is maintained only by the weight of the butterfly valve 18, and the elastic force of the butterfly valve 18 does not strongly maintain the closed state. There is no change in and stable operation is possible. As a result, the pressure loss due to the butterfly valve 18 in each vent hole 30 becomes small, and it becomes possible to ventilate the room with a pressure difference smaller than that in the conventional technique.

In this embodiment, when the air flows out from the plurality of ventilation holes 30 to the outside of the room, as shown in FIG. Vortices are unlikely to be generated in the airflows flowing through the respective vent holes 30, and the airflows flowing through the respective ventholes 30 are merged together. Therefore, the airflows flowing from the respective ventholes 30 are substantially uniformly divided. be able to.

Further, in this embodiment, the upper partition 16a is
The outer end surfaces 16A of the plurality of partition pieces including the lower partition piece 16b, the left partition piece 16c (not shown), and the right partition piece 16d are in the range of 50 to 70 degrees with respect to the horizontal direction. This can be an embodiment corresponding to claim 2.

Therefore, the closed state can be maintained only by the weight of the butterfly valve 18, the elastic modulus does not change due to aging, and stable operation is possible. As a result, the pressure loss due to the butterfly valve 18 in each vent hole 30 becomes small, and it becomes possible to ventilate the room with a pressure difference smaller than that in the conventional technique.

By the way, the frame body having the opening for exhausting the indoor air of the vehicle according to the above-mentioned embodiment is composed of the frame body 13 and the flange portion 14. However, when the present invention is carried out, the frame is It does not matter whether or not the body 13 and the flange portion 14 are integrated, and the presence of the flange portion 14 is not required.

The partition for dividing the flow of the vehicle interior air by dividing the opening of the frame body into a plurality of parts is the upper partition 16a.
And a lower partition 16b, a left partition 16c (not shown), and a right partition 16d. When the present invention is carried out, if the two-dimensional space is divided into a plurality of spaces. Well, it is not always necessary that the divided areas be uniform.

The attachment of the plate-shaped butterfly valve 18 of this embodiment is performed by the upper partition 16a and the lower partition 1.
Although it is attached directly to 6b, a rib for attachment may be formed from the upper partition 16a and the lower partition 16b, and the rib may be attached to the rib. At this time, it is necessary for the ribs to have the least air resistance.

Further, in this embodiment, the upper partition 16
a and lower partition pieces 16b and the like, the lower position extends outward more than the upper position, and the butterfly valve 18 causes the outer end surface 16 of the partition piece to be expanded under the non-ventilated state of the indoor air.
It is arranged in A in a substantially straight line shape and is in a sealed state. However, when the present invention is carried out, there is a case where the slightly straight line shape cannot be maintained due to the attachment of the butterfly valve 18. As a result, when implementing the present invention,
The partition pieces such as the upper partition piece 16a and the lower partition piece 16b extend outward more in the lower position than in the upper position, and the butterfly valve 18 causes the outer end surface 16A of the partition piece under the non-ventilated state of the indoor air. What is necessary is just to arrange | position at substantially the same angle and to make a sealing state.

[0044]

As described above in detail, the vent duct according to the first aspect of the present invention has a frame body having an opening for ventilating the air inside the vehicle compartment, and the opening of the frame body divided into a plurality of compartments. In a vent duct comprising a partition that divides the flow of air, and a plate-shaped butterfly valve whose upper end is fixed to the partition and whose lower end is openable and closable,
A lower position extends more outward than an upper position, and the butterfly valve is arranged at substantially the same angle on the outer end surface of the partition piece in a non-ventilated state of the indoor air to be in a sealed state. Is.

Therefore, since the butterfly valve that comes into surface contact with the outer end surface of the partition piece maintains the closed state of each vent hole by the vector component based on the tilt angle due to its own weight, each butterfly valve is controlled by the weight of each butterfly valve. Since the inner surfaces of the butterfly valves are in surface contact with each other and the closed state of the butterfly valve is maintained, the closed state can be easily released by a further difference in air pressure. Further, even if the pressure on the outside of the automobile increases, each butterfly valve will not open. And, even if water pressure from the outside of the vehicle is applied during car wash, the water that is kept closed and that adheres to the outer surface of each butterfly valve can flow downward, Does not flow into the passenger compartment. Furthermore, since the closed state is maintained only by the weight component of the butterfly valve, the elastic modulus does not change due to aging, and stable operation is possible. As a result, the pressure loss due to the butterfly valve in each vent hole becomes small, and it becomes possible to ventilate the room with a small pressure difference. In addition, when the air flows out from the plurality of ventilation holes to the outside of the room, the air flows in almost the same direction, and interfere with the air flows flowing out of the ventilation holes, and the air flows merge together. The airflow flowing from the pores can be split almost uniformly.

According to the vent duct of claim 2, in addition to the effect of claim 1, the outer end surfaces of the plurality of partition pieces are in the range of 50 to 70 degrees with respect to the horizontal direction.
The butterfly valve's own weight component is easy to adjust, the elastic modulus does not change due to aging, and stable operation is possible, and the pressure loss due to the butterfly valve in each vent is small, and the pressure difference in the room is small with a small pressure difference. Ventilation is possible.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view showing a main part of a vent duct according to an embodiment of the present invention.

FIG. 2 is a sectional view of a main part of a vent duct according to the embodiment of the present invention.

FIG. 3 is a cross-sectional view of a main part of a vent duct according to an embodiment of the present invention under ventilation.

FIG. 4 is a cross-sectional view of an essential part showing the structure of a vent duct as a comparative example corresponding to FIG.

FIG. 5 is a characteristic diagram showing measurement results of pressure loss shown in the embodiment of the present invention and Comparative Examples 1 and 2.

FIG. 6 is a perspective view of a passenger car having a conventional vent duct.

FIG. 7 is an explanatory view of a cross section of a conventional vent duct attached to a passenger car.

[Explanation of symbols]

 13 Frame Main Body 14 Flange 16 Partition Section 16A Outer End Face 18 Butterfly Valve α Tilt Angle

Claims (2)

[Claims] 1. A frame body having an opening for ventilating the vehicle interior air of an automobile, a partition piece for dividing the flow of the vehicle interior air by dividing the opening of the frame body into a plurality of pieces, and an upper end of the partition piece. In a vent duct comprising a plate-shaped butterfly valve whose bottom end is openable and closable, the partition piece has a lower position extending outward more than an upper position, In the non-ventilated state, the butterfly valve is arranged at substantially the same angle on the outer end surface of the partition piece,
A vent duct that is in a sealed state. 2. The vent duct according to claim 1, wherein the outer end surfaces of the plurality of partition pieces are in the range of 50 to 70 degrees with respect to the horizontal direction.